Proton conducting polymer blends from poly(2,5‐benzimidazole) and poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid)

Şen, Ünal; Acar, Oktay; Bozkurt, Ayhan; Ata, Ali

doi:10.1002/app.33026

Cited by 21 publications

(9 citation statements)

References 33 publications

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“…Frequency dependent AC conductivities of the membrane (σac (ω)) were calculated from the following equation . [2,11,14,15,17,[19][20][21]27] By the extrapolation of frequency independent plateau regions to zero frequency, the direct current (DC) conductivities (σdc) (i.e. Arrhenius plots) of the membranes were derived.…”

Section: Proton Conductivitymentioning

confidence: 99%

Anhydrous proton conducting poly(vinyl alcohol) (PVA)/ poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS)/1,2,4-triazole composite membrane

Erkartal

Aslan

Erkılıç

et al. 2016

International Journal of Hydrogen Energy

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The design and fabrication of anhydrous proton exchange membranes are critically important for high temperature proton exchange membrane fuel cell (HT-PEMFC) operating between 100 and 200 °C. Herein, we demonstrate a novel proton conducting membrane consisting of poly(vinyl alcohol) (PVA), poly (2-acrylamido-2-methylpropane sulfonic acid) (PAMPS) and 1,2,4-Triazole, which was fabricated by physical blending, casting and solvent evaporation techniques. The in-situ chemical cross-linking was performed by glutaraldehyde (GA) to improve the water management of the membranes. The molecular structure of the membranes and intermolecular interactions between the constituents were confirmed by Fourier-transform infrared spectroscopy (FT-IR). The surface and cross-section morphologies of the membranes were observed by scanning electron microscopy (SEM). The thermal stability performance of the membranes was studied with thermogravimetric analysis (TGA). In order to determine the physico-chemical properties of the membranes, water uptake (WU), dimensional change and ion exchange capacity (IEC) tests were carried out. The proton conductivities of composite membranes increase with the temperature and the temperature dependencies exhibit an

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Section: Proton Conductivitymentioning

confidence: 99%

Anhydrous proton conducting poly(vinyl alcohol) (PVA)/ poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS)/1,2,4-triazole composite membrane

Erkartal

Aslan

Erkılıç

et al. 2016

International Journal of Hydrogen Energy

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“…Several authors have studied novel polyelectrolyte systems with high conductivity at temperatures from 100 • C to 200 • C as an alternative solution to the commercial perfluorinated polyelectrolytes (e.g., Nafion), which show high conductivities only through water-assisted proton conduction [10][11][12] and operate at temperatures below 100 • C [13]. To date, building strong acid-base complexes among functionalities connected to the polymeric backbones has been one of the most well-known methods that enable high proton conductivity under low humidity or even anhydrous conditions [14][15][16][17][18][19][20]. In these materials, a homogeneous polymeric blend is formed by strong multiple acid-base interactions and hydrogen bonding networks, allowing proton conductivity by Bronsted acid-base pairs.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

et al. 2021

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Polymer electrolyte membrane (PEM) composed of polymer or polymer blend is a vital element in PEM fuel cell that allows proton transport and serves as a barrier between fuel and oxygen. Understanding the microscopic phase behavior in polymer blends is very crucial to design alternative cost-effective proton-conducting materials. In this study, the mesoscale morphologies of Nafion/poly(1-vinyl-1,2,4-triazole) (Nafion-PVTri) and Nafion/poly(vinyl phosphonic acid) (Nafion-PVPA) blend membranes were studied by dissipative particle dynamics (DPD) simulation technique. Simulation results indicate that both blend membranes can form a phase-separated microstructure due to the different hydrophobic and hydrophilic character of different polymer chains and different segments in the same polymer chain. There is a strong, attractive interaction between the phosphonic acid and sulfonic acid groups and a very strong repulsive interaction between the fluorinated and phosphonic acid groups in the Nafion-PVPA blend membrane. By increasing the PVPA content in the blend membrane, the PVPA clusters’ size gradually increases and forms a continuous phase. On the other hand, repulsive interaction between fluorinated and triazole units in the Nafion-PVTri blend is not very strong compared to the Nafion-PVPA blend, which results in different phase behavior in Nafion-PVTri blend membrane. This relatively lower repulsive interaction causes Nafion-PVTri blend membrane to have non-continuous phases regardless of the composition.

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“…The presence of two nitrogen sites in the ABPBI backbone allows higher retention of acid per benzimidazole unit compared to PBI when immersed in acid baths of same concentrations and thus enhance proton conductivity properties . Modifications have been made to the basic polymeric membrane by changing the synthesis procedure, using polymeric blends, incorporating organic and inorganic particles, making structural changes in order to improve proton conductivities and thermal, mechanical, and chemical stabilities . While blends of ABPBI/poly(vinylphosphonic acid) (ABPBI/PVPA) and ABPBI/poly(styrene sulfonic acid) (ABPBI/PSSA) reported proton conductivities of the order of 10 −3 S/cm at elevated temperatures, ABPBI/PAMPS [poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid] blend membranes have been reported to exhibit conductivity as high as 0.1 S/cm under 50% RH.…”

Section: Introductionmentioning

confidence: 99%

Salt‐leaching technique for the synthesis of porous poly(2,5‐benzimidazole) (ABPBI) membranes for fuel cell application

Das

Ghosh

Ganguly

et al. 2017

J of Applied Polymer Sci

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The first instance of synthesizing porous poly(2,5-benzimidazole) (ABPBI) membranes for high-temperature polymer electrolyte membrane fuel cells (HT-PEMFCs), using solvent evaporation/salt-leaching technique, is reported herein. Various ratios of sodium chloride/ABPBI were dissolved in methanesulfonic acid and cast into membranes by solvent evaporation, followed by porogen (salt) leaching by water washing. The membranes were characterized using SEM, FTIR, TGA, and DSC. The proton conductivity, water and acid uptake of the membranes were measured and the chemical stability was determined by Fenton's test. SEM images revealed strong dependence of sizes and shapes of pores on the salt/polymer ratios. Surface porosities of membranes were estimated with Nis Elements-D software; bulk porosities were measured by the fluid resaturation method. Thermogravimetric analysis showed enhanced dopant uptake with introduction of porosity, without the thermal stability of the membrane compromised. Incorporating pores enhanced solvent uptake and retention because of capillarity effects, enhancing proton conductivities of PEMs. Upon acid doping, a maximum conductivity of 0.0181 S/cm was achieved at 130 8C for a porous membrane compared with 0.0022 S/cm for the dense ABPBI membrane at the same temperature. Results indicated that with judicious optimization of porogen/polymer ratios, porous ABPBI membranes formed by salt-leaching could be suitably used in HT-PEMFCs. V C 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45773.

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Proton conducting polymer blends from poly(2,5‐benzimidazole) and poly(2‐acrylamido‐2‐methyl‐1‐propanesulfonic acid)

Cited by 21 publications

References 33 publications

Anhydrous proton conducting poly(vinyl alcohol) (PVA)/ poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS)/1,2,4-triazole composite membrane

Anhydrous proton conducting poly(vinyl alcohol) (PVA)/ poly(2-acrylamido-2-methylpropane sulfonic acid) (PAMPS)/1,2,4-triazole composite membrane

Mesoscale Morphologies of Nafion-Based Blend Membranes by Dissipative Particle Dynamics

Salt‐leaching technique for the synthesis of porous poly(2,5‐benzimidazole) (ABPBI) membranes for fuel cell application

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